ElectricSubaru


Customizations

Some extra upgrades, not strictly needed for the electric conversion.

Hood Lift Struts

The hood prop normally attaches to the left hand radiator bracket when in the stored position. Rather than install the radiator bracket, I installed the Redline Tuning Hood QuickLIFT. The kit included pop rivets for the hood brackets. I used rivet nuts instead, to allow removing the bracket. Some rattle can paint matches the brackets to the car.

Hood lift struts Hood lift struts

Shift Boot and Knob

Red rally stripe knob, by SickSpeed. Leather shift boot and e-brake boot with red stitching from Redline Automotive Accessories.

Shifter

Red Hazard Switch

Subaru part number 83037FE030. This switch came stock only with the 2007 STI Limited. Subaru made just 800 of those cars.

Knob

Intake Resonator Removal

Here is how to remove the intake resonator ("chamber" in Subaru speak).

  1. Remove the nut from between the input and output of the resonator, under the hood
  2. Remove the right front wheel
  3. Remove the clips holding the front of the inner fender liner until you can get you hands inside
  4. Reach up inside the fender and remove the lower resonator bolt

Resonator Resonator Resonator

Use Subaru part 46059FA000 to plug the input hole. Subaru leaves blocking the output hole as an exercise.

Resonator Resonator

Fog Lights

Fog lights Fog lights

Part NumberDescription
H4510FE030Fog Lamp Kit
H4518FE100WGFog Lamp Trim Kit, Aspen White
H4518FE100WUFog Lamp Trim Kit, Satin White Pearl
H4518FE100TGFog Lamp Trim Kit, Premium Silver Metallic
H4518FE100LRFog Lamp Trim Kit, Urban Grey Metallic
H4518FE100VWFog Lamp Trim Kit, Obsidian Black Pearl
H4518FE100DJFog Lamp Trim Kit, Newport Blue Pearl
H4518FE100BWFog Lamp Trim Kit, Aqua Blue Metallic
H4518FE100PGFog Lamp Trim Kit, WR Blue Mica
H4518FE100ROFog Lamp Trim Kit, Garnet Red Pearl

Yellow fog light covers from Lamin-x.

HD Radio

Most aftermarket car stereos had most of the features I wanted, but only one had them all, the Pioneer DEH-4400HD. One key feature is how easy it is to tune the HD subchannels.

HD Radio

Synthetic Gear Oil

Synthetic gear oil in both the transmission and rear differential.

Gear Oil

Auto Dimming Mirror with Compass and Homelink

Mirror part number H501SAG100 fits Impreza 2002-2007. Mount adapter part number H501SSA040.

Mirror Mirror Instructions

2005 Tail Lights

The 2006-2007 Impreza tail lights are mostly chrome. Tail lights should be red. The 2005 tail lights are red, and are a direct fit. The 2005 tail light part numbers are 84201FE241 and 84201FE251. Unlike most Subaru parts that are sold exclusively by dealers, these lights are widely available on the open market sold under the TYC brand name. TYC is the OEM supplier.

2006 Subaru Impreza Tail Light 2005 Subaru Impreza Tail Light

Scoopless Hood

A hood from the non-turbo version of the car keeps rain off the electrics. The non-turbo car did not come in World Rally Blue, so this hood had to be painted.

2006 WR Blue Scoopless Hood

Center High Mounted Stop Lamp Delete

The 2002-2007 WRX wing contains a Center High Mounted Stop Lamp (CHMSL), or "third brake light". Impreza without a wing have a CHMSL inside the cabin on the rear shelf/package tray. Most of these WRXs were originally constructed without a wing. WRX STIs and yellow painted WRXs left the factory with a wing. Dealers added wings to most WRXs that did not already have them and they left the existing CHMSL on the rear shelf in place and connected. Most 2002-2007 WRX sedans were sold with two CHMSLs.

Impreza Center High Mounted Stop Lamp

To properly delete the redundant lamp, replace the rear shelf with part 65510FE100OE. This requires removing the:

Impreza Package Tray 65510FE010OE Impreza Package Tray 65510FE100OE

LED Lighting

To reduce current draw on the 12V system, I replaced some lamps with LEDs. I did not bother with lamps that are energized for short periods of time such as back up lights and turn signals. Unfortunately, the headlight low beams do not accommodate LED replacements, due to the size of the heat sinks and fans.

LED Lighting

The SYLVANIA Automotive Lighting Guide was helpful to identify most of the lamps. A lot of LED lamps on the market are crap. I rejected 2-3 products for each location before settling on the selections below.

Location Type Lamps Product CostAmps BeforeAmps AfterAmps Reduction
Fog H3 2 Deyou Lighting DY-H3W-CRX-50W $35 8.40 0.338.1
Brake (A) 7440 2 JLC 7440 7443 T20 Plasma $32 3.48 0.383.1
Tail (B) 7443 2 JDM Astar Bright AX-2835 $17 0.84 0.260.6
Tail/Brake (C) 7443 2 Putco 247443R-360 $55 0.84/4.220.09/1.010.8/3.2
Center brake P21W 1 Jtech 1156 BA15S 13W LED Red $30 1.72 0.271.4
License 2825 2 Zone Tech 8-SMD T10 W5W $10 0.66 0.080.6
Dome DE31751 Cutequeen DE3175 16-SMD $6 0.60 0.060.5
Trunk 168 1 Sylvania 168/194/2825 LEDriving $11 0.36 0.060.3

Tail and Brake Light Lamps

The lamp type in tail light location B is 7443, which is a dual filament lamp. The car drives only the dimmer of the two circuits in the lamp. A dual brightness LED lamp is not required in this position.

The center brake lamp in the spoiler is already LEDs. The lamp listed above is for the interior fixture.

Steering Wheel Cover

The Custom Accessories 37000 steering wheel cover gives you the feeling of driving a Ferrari for just $6.

Steering Wheel Cover Steering Wheel Cover

Side Sill Spoilers

In its earlier days, this WRX was an unrefined, bare bones TR (Tuner Ready) without any fluff such as side spoilers. With a fancy new power plant, the car has graduated from knickerbockers to big boy trousers. Installing these items required drilling 10 holes along the sides of the sills. To figure those hole locations, I removed the side spoilers from a similar WRX and measured. The 12 holes underneath the sills exist already. They contained plastic plugs covered with undercoat. The side spoilers come in either the new curvy style or old straight style and in body color or black. I choose old black.

Parts needed:

Side Spoilers Side Spoilers

Red Badge of Amperage

The front and rear badges got decal overlays from Auto City Imports.

Impreza Badge Decal Impreza Badge Decal

Impreza Badge Decal Impreza Badge Decal

The steering wheel got one too.

Impreza Badge Impreza Badge

The badges next to the key lock were repainted with red accents instead of black and blue. To remove the badges, I heated them with a heat gun, then ran nylon line behind them with a sawing motion. To reapply, I used 3M heavy duty mounting tape.

Impreza Badge Impreza Badge Impreza Badge Impreza Badge

Seat Covers

Black and red seat covers from LeatherSeats.com. These covers are not leather, but vinyl. The seat covers were easy enough to do myself. The door panels were a bit trickier; I had an automotive upholstery shop do them.

Seat Covers Seat Covers

Wheels

The rims are from an older model of the Impreza WRX, the 2002-2004. They are painted gunmetal, with a red pinstripe. The rim size is 16x6.5, which is smaller than the original of 17x7. There was a slight interference with the big front brakes that was solved with a 5mm wheel spacer, the H&R 1025560. The pinstripe is 1/8in wide red Prostripe R20830. I applied the tape using a small piece of cardboard with a slit as a guide to keep it spaced even to the rim edge. The tires are a quiet running summer tire, the Continental ExtremeContact DW 205/55ZR-16.

Wheels Wheels Wheels

Fog Lights as Daytime Running Lights

The wiring is modified so that the fog lights can be turned on even when the headlights are turned off. This allows saving some power by using the LED fog lights as daytime running lights instead of the incandescent headlights. Normally when the headlight switch is off, the headlights are not off but merely dimmed by routing power through a power resistor (the DRL resistor). The resistor simply wastes some power so that the total used is the same as if the headlights were on at full brightness.

The first step is to unplug the DRL resistor. Now the headlights are either fully on or fully off. Then, reroute the wiring as shown in the diagram below. The basic idea is for power to come to the fog light relay coil from the parking switch instead of the high-beam relay. This way, the fog lights can be turned on when the headlight switch is in the first position. You can find detailed instructions on several Subaru forums. I did not ground the yellow-blue wire from the fog light switch. Grounding that wire allows the fog lights to remain on when the high beams are on.

Subaru Impreza Independant Fog Light Mod Subaru Impreza Independant Fog Light Mod Subaru Impreza Independant Fog Light Mod

WRX Pedals

Subaru WRX TR Pedal Mod Subaru WRX TR Pedal Mod

The 2006-2007 WRX TR comes with plain black pedals. Upgrading the clutch and brake pedals to the WRX style is easy. The accelerator is a bit more difficult.

The clutch and brake pedals have covers with a hard rubber lip. They can be pulled off and replaced with the WRX covers, part 36024FA010. These pedal covers are often sold in a set of three, along with the accelerator pad, part 36024FA001. This accelerator pad is intended for earlier model years and does not fit the 2006-2007 Impreza accelerator assembly.

Subaru WRX TR Pedal Mod

The 2006-2007 WRX STI accelerator assembly (part 36010FE040) fits the bill, almost. It is physically compatible and has the same electrical connector, but the connector pinout differs among the turbo, STI, and normally aspirated cars. The WRX TR stock accelerator assembly part number is 36010SA060.

Subaru WRX TR Pedal Mod Subaru WRX TR Pedal Mod

To get around the wiring mismatch, the connector and sensor can be moved from the old assembly to the new assembly. Thus, the original connector and sensor remain in the car. Note that the service manual advises "Accelerator pedal cannot be disassembled." It is held together by Torx head screws to discourage you. Use this method at your own risk.

Subaru WRX TR Pedal Mod Subaru WRX TR Pedal Mod

The new hybrid accelerator assembly produces slightly different voltages at the minimum and maximum positions. The difference is enough to require recalibrating the motor controller throttle input. If I were modifying the pedal in a gas car, I would recalibrate the ECU. Alteratively, the pedal stops could be trimmed or shimmed until the voltage range matches exactly.

PositionBeforeAfterDifference% of range
Min0.66V0.69V0.03V1.2%
Max3.12V3.19V0.07V2.8%

The dead pedal is an aftermarket product, purchased from FastWRX. Subaru does not make a fancy dead pedal. The rubber pads are attached with weak double stick tape. The small pads come off easily. The remedy is to pull them out, remove the tape, and glue them. The metal is very smooth. Scoring with an awl helps the glue ahere. Acetone removes residue left from the tape.

Subaru WRX TR Pedal Mod